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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 90 · 40 questions
TalentJR

The method (Round, then calculate): Round each number to the nearest ten, hundred or whole number. Do the easy sum with the rounded numbers. Pick the option nearest to it. To round a number, look at the digit after the place you keep: 5 or more goes up, less than 5 stays.

NameDateTime takenScore ___ / 40
  1. 1.Which is closest to 896 + 698 + 101? (a) 1900 (b) 1600 (c) 1700 (d) 1800
  2. 2.Round 12027 to the nearest ten.
  3. 3.Round 59.78 to one decimal place. =
  4. 4.Which is closest to 597 + 99 + 398? (a) 1200 (b) 1100 (c) 1000 (d) 1300
  5. 5.Which is closest to 2503 ÷ 51? (a) 100 (b) 25 (c) 50 (d) 500
  6. 6.Round 63.12 to one decimal place. =
  7. 7.Round 86312 to the nearest hundred.
  8. 8.Round 98.56 to one decimal place. =
  9. 9.Which is closest to 901 × 90? (Round each number first.) (a) 81000 (b) 8100 (c) 810000 (d) 162000
  10. 10.Which is closest to 304 × 79? (Round each number first.) (a) 48000 (b) 24000 (c) 240000 (d) 2400
  11. 11.Which is closest to 195 + 101 + 201? (a) 700 (b) 600 (c) 500 (d) 400
  12. 12.Which is closest to 296 + 96 + 300? (a) 800 (b) 700 (c) 600 (d) 900
  13. 13.Which is closest to 604 + 595 + 900? (a) 2000 (b) 2200 (c) 2300 (d) 2100
  14. 14.Which is closest to 597 + 697 + 597? (a) 2000 (b) 1800 (c) 2100 (d) 1900
  15. 15.Which is closest to 795 + 303 + 697? (a) 1700 (b) 1800 (c) 2000 (d) 1900
  16. 16.Round 17.49 to one decimal place. =
  17. 17.Which is closest to 97 + 705 + 105? (a) 1100 (b) 800 (c) 900 (d) 1000
  18. 18.Which is closest to 396 × 28? (Round each number first.) (a) 1200 (b) 120000 (c) 12000 (d) 24000
  19. 19.Which is closest to 400 + 897 + 97? (a) 1300 (b) 1600 (c) 1500 (d) 1400
  20. 20.Which is closest to 698 + 604 + 205? (a) 1700 (b) 1400 (c) 1600 (d) 1500
  21. 21.Which is closest to 498 × 89? (Round each number first.) (a) 4500 (b) 90000 (c) 450000 (d) 45000
  22. 22.Round 39.47 to one decimal place. =
  23. 23.Which is closest to 605 ÷ 29? (a) 40 (b) 200 (c) 20 (d) 10
  24. 24.Round 93927 to the nearest hundred.
  25. 25.Which is closest to 597 × 80? (Round each number first.) (a) 480000 (b) 96000 (c) 4800 (d) 48000
  26. 26.Which is closest to 2393 ÷ 31? (a) 80 (b) 800 (c) 40 (d) 160
  27. 27.Round 15019 to the nearest ten.
  28. 28.Round 41.41 to one decimal place. =
  29. 29.Which is closest to 597 × 21? (Round each number first.) (a) 120000 (b) 12000 (c) 24000 (d) 1200
  30. 30.Which is closest to 397 × 91? (Round each number first.) (a) 360000 (b) 36000 (c) 72000 (d) 3600
  31. 31.Round 58.33 to one decimal place. =
  32. 32.Round 84928 to the nearest ten.
  33. 33.Round 7687 to the nearest hundred.
  34. 34.Round 17.13 to one decimal place. =
  35. 35.Which is closest to 800 ÷ 39? (a) 200 (b) 40 (c) 20 (d) 10
  36. 36.Which is closest to 799 + 798 + 103? (a) 1800 (b) 1900 (c) 1600 (d) 1700
  37. 37.Which is closest to 1793 ÷ 29? (a) 30 (b) 120 (c) 60 (d) 600
  38. 38.Round 64145 to the nearest hundred.
  39. 39.Round 23.39 to one decimal place. =
  40. 40.Round 33.93 to one decimal place. =

Answer key

  1. 1700
  2. 12030
  3. 59.8
  4. 1100
  5. 50
  6. 63.1
  7. 86300
  8. 98.6
  9. 81000
  10. 24000
  11. 500
  12. 700
  13. 2100
  14. 1900
  15. 1800
  16. 17.5
  17. 900
  18. 12000
  19. 1400
  20. 1500
  21. 45000
  22. 39.5
  23. 20
  24. 93900
  25. 48000
  26. 80
  27. 15020
  28. 41.4
  29. 12000
  30. 36000
  31. 58.3
  32. 84930
  33. 7700
  34. 17.1
  35. 20
  36. 1700
  37. 60
  38. 64100
  39. 23.4
  40. 33.9

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